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Glossary
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Expansion and contraction to eliminate binary noise in the image
When an image is converted to black and white, a number of unwanted dots may appear in the image.
These noises can be eliminated during the preliminary processing. Dot control processing of binary val-
ues is used to eliminate this problem, as described below.
- 1
Expansion
If a white area contains a single, isolated black point, the system will interrupt the black point to
white.
2
Contraction
If a black area contains a single, isolated white point, the system will converts the white point to
black.
- 1
Expansion
Delete isolated black points by expansion and then restore the original image size by contraction.
2
Contraction
Delete isolated white points by contraction and then restore the original image size by expansion.
[F]
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Fillet width (shading width)
Size of a hollow rectangle which closely matches to the target object in a binary image (white part).
Horizontal direction: Length of a side parallel to the X axis. Vertical direction: Length of a side parallel to
the Y axis.
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Flat width
- See "Edge detection."
G
_
contraction
_
expansion
Fillet width (horizontal)
G-4
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